Description of problem:
In 6.1 we have:
hammer docker --help
Usage:
    hammer docker [OPTIONS] SUBCOMMAND [ARG] ...

Parameters:
 SUBCOMMAND                    subcommand
 [ARG] ...                     subcommand arguments

Subcommands:
 container                     Manage docker containers
 image                         Manage docker images
 registry                      Manage docker registries
 tag                           Manage docker tags

But in 6.2:
hammer docker --help
Usage:
    hammer docker [OPTIONS] SUBCOMMAND [ARG] ...

Parameters:
 SUBCOMMAND                    subcommand
 [ARG] ...                     subcommand arguments

Subcommands:
 container                     Manage docker containers
 tag                           Manage docker tags

However we have corresponding API paths:
Registries:

GET /docker/api/v2/registries 	        List all docker registries
GET /docker/api/v2/registries/:id 	Show a docker registry
POST /docker/api/v2/registries 	        Create a docker registry
PUT /docker/api/v2/registries/:id 	Update a docker registry
DELETE /docker/api/v2/registries/:id 	Delete a docker registry

And they are working fine, so it seems issue is specific for Hammer

Version-Release number of selected component (if applicable):
6.2 SNAP 3.1

How reproducible:
Always

Steps to Reproduce:
1. Try to create docker registry through CLI

Actual results:
Necessary commands are absent in hammer

Expected results:
Necessary operations with docker can be performed successfully

Additional info: